diff --git a/app/app.go b/app/app.go
index 87779d1..a16b8e8 100644
--- a/app/app.go
+++ b/app/app.go
@@ -69,12 +69,7 @@ func (a *APP) Start() error {
 		return err
 	}
 
-	globalReset, err := a.SettingService.GetGlobalReset()
-	if err != nil {
-		return err
-	}
-
-	err = a.cronJob.Start(loc, trafficAge, statsBucketSeconds, globalReset)
+	err = a.cronJob.Start(loc, trafficAge, statsBucketSeconds)
 	if err != nil {
 		return err
 	}
diff --git a/cronjob/cronJob.go b/cronjob/cronJob.go
index 9227738..7da0fce 100644
--- a/cronjob/cronJob.go
+++ b/cronjob/cronJob.go
@@ -4,17 +4,11 @@ import (
 	"time"
 
 	"github.com/alireza0/s-ui/logger"
+	"github.com/alireza0/s-ui/service"
 
 	"github.com/robfig/cron/v3"
 )
 
-// cronParser accepts standard 5-field cron, optional leading seconds (6-field)
-// and descriptors (@daily, @weekly, @every 10s, ...). Used both for the cron
-// engine and for parsing the user-provided globalReset spec.
-var cronParser = cron.NewParser(
-	cron.SecondOptional | cron.Minute | cron.Hour | cron.Dom | cron.Month | cron.Dow | cron.Descriptor,
-)
-
 type CronJob struct {
 	cron *cron.Cron
 }
@@ -23,14 +17,14 @@ func NewCronJob() *CronJob {
 	return &CronJob{}
 }
 
-func (c *CronJob) Start(loc *time.Location, trafficAge int, statsBucketSeconds int64, globalReset string) error {
+func (c *CronJob) Start(loc *time.Location, trafficAge int, statsBucketSeconds int64) error {
 	// Recover: robfig/cron does not recover panics by default, and gin only
 	// covers the HTTP side. SkipIfStillRunning: the stats job fires every 10s,
 	// can block that long on the write lock, and overlapping runs each drain
 	// the core's traffic counters.
 	c.cron = cron.New(
 		cron.WithLocation(loc),
-		cron.WithParser(cronParser),
+		cron.WithParser(service.CronParser),
 		cron.WithChain(
 			cron.Recover(cron.DefaultLogger),
 			cron.SkipIfStillRunning(cron.DefaultLogger),
@@ -48,15 +42,10 @@ func (c *CronJob) Start(loc *time.Location, trafficAge int, statsBucketSeconds i
 	addJob("@every 10s", NewStatsJob(trafficAge > 0, statsBucketSeconds), "stats job")
 	// Start expiry job
 	addJob("@every 1m", NewDepleteJob(), "deplete job")
-	// Periodic global traffic reset, only when a valid cron spec is configured
-	if globalReset != "" && globalReset != "off" {
-		schedule, err := cronParser.Parse(globalReset)
-		if err != nil {
-			logger.Warning("invalid globalReset cron spec <", globalReset, ">: ", err)
-		} else {
-			addJob(globalReset, NewResetTrafficJob(schedule), "traffic reset job")
-		}
-	}
+	// Periodic global traffic reset. Polled rather than scheduled on the spec
+	// itself: the spec was read once at start, so a saved change did nothing
+	// until the panel was restarted.
+	addJob("@every 1m", NewResetTrafficJob(), "traffic reset job")
 	// Start deleting old stats
 	if trafficAge > 0 {
 		addJob("@daily", NewDelStatsJob(trafficAge), "old stats cleanup")
diff --git a/cronjob/resetTrafficJob.go b/cronjob/resetTrafficJob.go
index b028bfa..018fd8b 100644
--- a/cronjob/resetTrafficJob.go
+++ b/cronjob/resetTrafficJob.go
@@ -5,22 +5,37 @@ import (
 
 	"github.com/alireza0/s-ui/logger"
 	"github.com/alireza0/s-ui/service"
-
-	"github.com/robfig/cron/v3"
 )
 
 type ResetTrafficJob struct {
 	service.ClientService
 	service.ConfigService
 	service.SettingService
-	schedule cron.Schedule
 }
 
-func NewResetTrafficJob(schedule cron.Schedule) *ResetTrafficJob {
-	return &ResetTrafficJob{schedule: schedule}
+func NewResetTrafficJob() *ResetTrafficJob {
+	return &ResetTrafficJob{}
 }
 
+// Run reads the spec on every tick, so a saved schedule applies without a
+// panel restart. globalResetLast holds the next armed boundary; 0 means none.
 func (s *ResetTrafficJob) Run() {
+	spec, err := s.SettingService.GetGlobalReset()
+	if err != nil {
+		logger.Warning("ResetTrafficJob: get schedule failed: ", err)
+		return
+	}
+	if spec == "" || spec == "off" {
+		return
+	}
+	// Save rejects a bad spec, so this only trips on one written before that
+	// check existed. Debug, not Warning: it would repeat every minute.
+	schedule, err := service.CronParser.Parse(spec)
+	if err != nil {
+		logger.Debug("ResetTrafficJob: invalid cron spec <", spec, ">: ", err)
+		return
+	}
+
 	loc, err := s.SettingService.GetTimeLocation()
 	if err != nil {
 		logger.Warning("ResetTrafficJob: get time location failed: ", err)
@@ -28,16 +43,22 @@ func (s *ResetTrafficJob) Run() {
 	}
 	now := time.Now().In(loc)
 
-	last, err := s.SettingService.GetGlobalResetLast()
+	next, err := s.SettingService.GetGlobalResetLast()
 	if err != nil {
 		logger.Warning("ResetTrafficJob: get last reset time failed: ", err)
 		return
 	}
-	// Logged, not a silent return: the setting holds the *next* boundary
-	// despite its name and is not cleared when the schedule changes, so a
-	// monthly-to-daily switch can look dead for up to a month.
-	if last > now.Unix() {
-		logger.Debug("ResetTrafficJob: next reset is at ", time.Unix(last, 0).In(loc).Format(time.RFC3339), ", nothing to do")
+	// A new or changed schedule: arm its first boundary rather than reset now.
+	if next == 0 {
+		next = schedule.Next(now).Unix()
+		if err = s.SettingService.SetGlobalResetLast(next); err != nil {
+			logger.Warning("ResetTrafficJob: set next reset time failed: ", err)
+			return
+		}
+		logger.Info("ResetTrafficJob: next reset at ", time.Unix(next, 0).In(loc).Format(time.RFC3339))
+		return
+	}
+	if next > now.Unix() {
 		return
 	}
 
@@ -57,10 +78,10 @@ func (s *ResetTrafficJob) Run() {
 	// Advance to the next boundary. schedule.Next returns the nearest upcoming
 	// occurrence, so if several periods were missed (e.g. downtime) it snaps
 	// forward instead of resetting once per missed period.
-	next := s.schedule.Next(now)
-	if err = s.SettingService.SetGlobalResetLast(next.Unix()); err != nil {
+	after := schedule.Next(now)
+	if err = s.SettingService.SetGlobalResetLast(after.Unix()); err != nil {
 		logger.Warning("ResetTrafficJob: set last reset time failed: ", err)
 		return
 	}
-	logger.Info("ResetTrafficJob: traffic reset for all clients; next reset at ", next.Format(time.RFC3339))
+	logger.Info("ResetTrafficJob: traffic reset for all clients; next reset at ", after.Format(time.RFC3339))
 }
diff --git a/service/setting.go b/service/setting.go
index e8772c2..a47d63f 100644
--- a/service/setting.go
+++ b/service/setting.go
@@ -14,9 +14,17 @@ import (
 	"github.com/alireza0/s-ui/logger"
 	"github.com/alireza0/s-ui/util/common"
 
+	"github.com/robfig/cron/v3"
 	"gorm.io/gorm"
 )
 
+// CronParser accepts standard 5-field cron, optional leading seconds (6-field)
+// and descriptors (@daily, @weekly, @every 10s, ...). Used both for the cron
+// engine and for parsing the user-provided globalReset spec.
+var CronParser = cron.NewParser(
+	cron.SecondOptional | cron.Minute | cron.Hour | cron.Dom | cron.Month | cron.Dow | cron.Descriptor,
+)
+
 var defaultConfig = `{
   "log": {
     "level": "info"
@@ -374,13 +382,14 @@ func (s *SettingService) GetSubURI() (string, error) {
 	return s.getString("subURI")
 }
 
-// GetGlobalReset returns the configured period for resetting all clients'
-// traffic: "off", "weekly", "monthly" or "yearly".
+// GetGlobalReset returns the cron spec for resetting all clients' traffic;
+// empty or "off" means disabled.
 func (s *SettingService) GetGlobalReset() (string, error) {
 	return s.getString("globalReset")
 }
 
-// GetGlobalResetLast returns the unix time of the last global traffic reset.
+// GetGlobalResetLast returns the unix time of the next armed global traffic
+// reset (despite the name), or 0 when no boundary is armed yet.
 func (s *SettingService) GetGlobalResetLast() (int64, error) {
 	str, err := s.getString("globalResetLast")
 	if err != nil {
@@ -480,6 +489,25 @@ func (s *SettingService) Save(tx *gorm.DB, data json.RawMessage) error {
 			}
 		}
 
+		// A bad spec used to be accepted here and only logged at the next
+		// panel start, so the reset silently never ran.
+		if key == "globalReset" && obj != "" && obj != "off" {
+			if _, err = CronParser.Parse(obj); err != nil {
+				return common.NewError("invalid cron spec <", obj, ">: ", err)
+			}
+		}
+		// globalResetLast holds the next boundary of the old schedule. Clear it
+		// on a change so the reset job arms the new one instead of waiting out
+		// the old period (a monthly-to-daily switch looked dead for a month).
+		if key == "globalReset" {
+			var old model.Setting
+			if tx.Where("key = ?", key).Limit(1).Find(&old).Error == nil && old.Value != obj {
+				if err = tx.Model(model.Setting{}).Where("key = ?", "globalResetLast").Update("value", "0").Error; err != nil {
+					return err
+				}
+			}
+		}
+
 		// Delete all stats if it is set to 0
 		if key == "trafficAge" && obj == "0" {
 			err = tx.Where("id > 0").Delete(model.Stats{}).Error
diff --git a/service/setting_global_reset_test.go b/service/setting_global_reset_test.go
new file mode 100644
index 0000000..b49b06c
--- /dev/null
+++ b/service/setting_global_reset_test.go
@@ -0,0 +1,56 @@
+package service
+
+import (
+	"encoding/json"
+	"testing"
+)
+
+// A bad spec used to save fine and only log a warning at the next panel
+// start, so the reset silently never ran.
+func TestSaveRejectsInvalidGlobalReset(t *testing.T) {
+	db := settingTestDB(t)
+	s := &SettingService{}
+
+	payload, _ := json.Marshal(map[string]string{"globalReset": "every monday"})
+	if err := s.Save(db, payload); err == nil {
+		t.Fatal("Save accepted an invalid cron spec")
+	}
+
+	for _, spec := range []string{"", "off", "0 0 1 * *", "30 0 0 * * *", "@weekly"} {
+		payload, _ := json.Marshal(map[string]string{"globalReset": spec})
+		if err := s.Save(db, payload); err != nil {
+			t.Errorf("Save rejected %q: %v", spec, err)
+		}
+	}
+}
+
+// globalResetLast holds the next boundary of the schedule in force. Left
+// alone on a change, a monthly-to-daily switch waited out the old month.
+func TestSaveClearsArmedResetOnScheduleChange(t *testing.T) {
+	db := settingTestDB(t)
+	s := &SettingService{}
+
+	save := func(spec string) {
+		t.Helper()
+		payload, _ := json.Marshal(map[string]string{"globalReset": spec})
+		if err := s.Save(db, payload); err != nil {
+			t.Fatal(err)
+		}
+	}
+
+	save("0 0 1 * *")
+	if err := s.SetGlobalResetLast(4102444800); err != nil {
+		t.Fatal(err)
+	}
+
+	// Same spec saved again, as the form does with every other change.
+	save("0 0 1 * *")
+	if last, _ := s.GetGlobalResetLast(); last != 4102444800 {
+		t.Errorf("unchanged spec cleared the armed boundary: %d", last)
+	}
+
+	save("0 0 * * *")
+	if last, _ := s.GetGlobalResetLast(); last != 0 {
+		t.Errorf("changed spec kept the old boundary: %d", last)
+	}
+}